Drying device

Abstract

To provide a dryer capable of more suitably circulating a drying object in a drying tank and of further improving drying efficiency.SOLUTION: A bottom face 15 of a drying tank 11 in a dryer 10, comprises a conical tapered face 15a tilting downward in the direction of a peripheral wall 12 from a top end, i.e., the periphery of the bottom end of a rotary shaft 20 penetrating the center thereof. A scrape-up blade 21A is constituted of a base blade 22A continuously extended from the other end of a scrape-up arm 30 with one end thereof attached to the rotary shaft 20. The scrape-up arm 30 is tiltingly extended from one end to the other end thereof along the tapered face 15a on the bottom face 15 of the drying tank 11 and is configured to be able to scrap up a drying object present on the tapered face 15a.SELECTED DRAWING: Figure 1

Claims

1. In a drying apparatus having a drying chamber having a vertical cylindrical shape into which an object to be dried is introduced, and a rotary lifting blade provided on a rotary shaft extending along a vertical axis in the drying chamber, the bottom surface portion of the drying chamber includes a conical tapered surface that slopes downward toward the peripheral wall portion with the rotary shaft passing through the center thereof as the apex around the rotary shaft, the rotary lifting blade consists of a base blade continuously extending from the other end of a scraping arm portion having one end attached to the rotary shaft, the scraping arm portion extends obliquely from one end to the other end along the tapered surface on the bottom surface portion of the drying chamber, and is configured to be able to scrape the object to be dried on the tapered surface, a peripheral edge side of the bottom surface portion of the drying chamber that is continuous with the inner surface of the peripheral wall portion forms a horizontal peripheral edge portion that circumscribes in a substantially horizontal manner with a predetermined width, the tapered surface of the bottom surface portion is formed from the apex around the rotary shaft to the inner peripheral edge of the horizontal peripheral edge portion, and the drying apparatus is characterized by this.

2. a plurality of the scraping arm portions are arranged radially around the rotary shaft, each extending from the rotary shaft to the inner peripheral edge of the horizontal peripheral edge portion, at the other end of each scraping arm portion, a base blade forming the rotary lifting blade is individually supported, and each base blade has a flat surface that extends in the circumferential direction along the horizontal peripheral edge portion in a plan view, and is capable of winding up the object to be dried while placing it at the starting end and moving it to the ending end, each base blade is characterized in that its respective flat surface extends spirally obliquely upward from the starting end to the ending end in a direction opposite to the rotation direction, and the drying apparatus according to claim 1.

3. On the upper side of the rotary lifting blade, another rotary lifting blade is provided in one or more stages at intervals along the rotary shaft, The rotary lifting blades from the second stage and later, excluding the lowermost rotary lifting blade disposed in the vicinity of the bottom surface portion of the drying chamber, consist of base blades continuously extending from the other end of a support arm portion having one end attached to the rotary shaft, Due to the rotation of the rotating shaft, for each of the multi-stage rotating lifting blades, the object to be dried is lifted while moving from the starting end to the ending end on the flat surface of each base blade, and is configured to sequentially rise to the upper-stage rotating lifting blades while being pressed against the inner surface of the peripheral wall portion in a thin film shape by centrifugal force. The drying device according to claim 2, characterized in that.

4. The scraping arm portion has a center line passing through a position shifted from the axis of the rotating shaft toward the rotation direction side of the rotating lifting blade, has a front edge parallel to the center line, and at the starting end of the base blade continuous with the front edge, is provided with a protruding piece protruding toward the rotation direction side of the rotating lifting blade. The drying device according to claim 2 or 3, characterized in that.

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